阅读说明：本技术 中置式连接的玻镁复合板对拼回风夹道施工工法 (Construction method of middle-mounted connected glass magnesium composite board split air return channel ) 是由 曹玉全 于 2021-09-13 设计创作，主要内容包括：本发明公开了中置式连接的玻镁复合板对拼回风夹道施工工法；本发明通过选用0.5mm复合板在折弯机上折两件50×79×50mm的折弯件,折弯件的长度根据板长确定,切割9.5mm石膏板两块,即为石膏板A7和石膏板B3,使石膏板能够放入折弯10㎜复合板内,具备置式连接的玻镁复合板对拼回风夹道以玻璃纤维为增强材料,氯氧镁水泥为胶凝材料,通过机械加工生产风管板材,并将风管板材粘合回风夹道,对拼回风夹道全部在工厂内生产完成,复核模块化生产的要求,安装方法与普通墙板一致,节省人工,对拼回风夹道板采用中空构造,无芯材泄露的风险,比较卫生环保,工艺先进、生产效率高、操作人员少、操作劳动强度低降低、产品质量稳定的优点。(The invention discloses a construction method of a middle-mounted connected glass-magnesium composite board butt-jointed air return channel; the invention selects the 0.5mm composite board to fold two 50X 79X 50mm bending pieces on the bending machine, the length of the bending piece is determined according to the length of the board, two 9.5mm gypsum boards are cut, namely a gypsum board A7 and a gypsum board B3, the gypsum board can be put into a bent 10 mm composite board, the spliced air return channel of the glass-magnesium composite board with the built-in connection uses glass fiber as a reinforcing material and magnesium oxychloride cement as a cementing material, air duct plates are produced by machining, the air duct plates are bonded with the air return channel, the spliced air return clip channel is completely produced in a factory, the requirements of modular production are rechecked, the installation method is consistent with that of a common wallboard, the labor is saved, the spliced air return channel plate has a hollow structure, does not have the risk of core material leakage, and has the advantages of sanitation, environmental protection, advanced process, high production efficiency, less operators, low operation labor intensity, reduction and stable product quality.)

1. The construction method of the split return air channel of the central connection type glass-magnesium composite board is characterized in that: the method comprises the following steps:

step 1: preparing before construction, and according to the design requirements of a construction scheme and carefully reading a construction drawing, deeply designing a splicing air return channel of the glass-magnesium composite plate connected in a central mode;

step 2: mounting the keel, wherein the keel is required to be mounted on the wall surface covered by the glass-magnesium composite board according to the design drawing requirement;

and step 3: cutting plates, namely cutting straight pipes by adopting a platform, and cutting reducing pipe fittings, such as reducing pipes, tee joints, elbows and the like by adopting a portable cutting machine;

and 4, step 4: prefabricating an air pipe and manufacturing the air pipe, wherein a platform type cutting machine is adopted when rectangular plates are cut, the cutting line of the plates is straight, and a special adhesive is required to be used for manufacturing and installing the air pipe so as to ensure the bonding quality of the air pipe;

and 5: manufacturing a straight pipe, scraping the step-shaped heat insulation layer of the side panel by using a scraper to ensure that the steps are smooth, and coating special glue on the steps on the side surfaces of the left and right panels to ensure that no gap exists at the joint and no residual glue exists on the outer wall of the air pipe;

step 6: the air duct connection and the glass magnesium composite board installation adopt flange-free staggered joint insertion and special adhesive bonding, and special adhesive is coated on the stepped surface, wherein the special adhesive is uniform and the using amount is reasonably controlled;

and 7: hoisting the air pipe, namely vertically installing the air pipe;

and 8: the air pipe is connected with the air valve, two ends of the air valve are made to be inserted, the outer diameter of an insertion opening of the air valve is equal to the inner diameter of the air pipe and is connected with a flange of the valve, and the air pipe is connected with the fan by adopting an aluminum foil flexible connection air pipe;

and step 9: and (5) checking and accepting, wherein the deviation of each manufacturing and mounting dimension meets the requirements of design and specification.

2. The construction method of the central-positioned connected glass-magnesium composite board split return air channel according to claim 1 is characterized in that: in the step 1, according to the design requirement of a construction scheme, carefully reading a construction drawing, deeply designing a splicing return air channel of the centrally-mounted connected glass-magnesium composite plate, implementing site constructors, and performing technical background crossing on the site constructors according to the scheme and the drawing; preparing and checking the quantity and specification of materials and equipment required by a central-positioned connected glass-magnesium composite plate splicing air return channel, wherein the materials and the equipment meet the relevant regulations of national standards; arranging constructors and equipment to enter a field, arranging the construction field and determining the stacking position of entering materials; the method is characterized in that a middle-mounted connected glass magnesium composite board butt-jointed return air channel transportation channel, a hoisting position and the like are defined, and auxiliary materials, tools and other related equipment and the like required in the installation process of the return air channel are prepared.

3. The construction method of the central-positioned connected glass-magnesium composite board split return air channel according to claim 1 is characterized in that: in the step 2, keels are required to be installed on the wall surface covered by the glass-magnesium composite board according to the requirements of a design drawing or a construction drawing, the keels are leveled, and the surfaces of the keels are smooth and are free of corrosion and five deformation; the structural wall body is subjected to construction pretreatment according to building specifications, and the arrangement size of the keel is matched with the arrangement of the glass-magnesium composite board; the distance between the wood keels is smaller than 300 mm, the distance between the light steel keels is not larger than 400 mm, and the installation of the keels is vertical to the length direction of the glass-magnesium composite board; the distance from the surface of the wood keel to the base layer is generally 50mm according to specific requirements, and the surface flatness and verticality errors of the wood keel are not more than 0.5 mm; the keel gap needs filler, and the installation and treatment are carried out in advance according to the design requirements, and the installation of the glass magnesium composite board is not influenced.

4. The construction method of the central-positioned connected glass-magnesium composite board split return air channel according to claim 1 is characterized in that: in the step 3, the straight pipe is cut by adopting a platform, and the reducing pipe fittings, such as reducing pipes, tee joints, elbows and the like, and the plates are cut by adopting a hand-held cutting machine; during cutting, the cutting line is straight, the length error of the diagonal line of the board is less than 5mm, and the step line, the cutting line and the board surface form an angle of 90 degrees; and cutting the bonding parts of the left and right plates and the upper and lower plates of the air pipe into a step shape, wherein the depth of the step line is 15 mm.

5. The construction method of the central-positioned connected glass-magnesium composite board split return air channel according to claim 1 is characterized in that: in the step 4, a platform type cutting machine is adopted when the rectangular plate is cut, the cutting line of the plate is straight, the cutting plane and the plate surface form an angle of 90 degrees, and the diagonal length error of the cut air duct plate is smaller than 3 mm; cutting the wind pipe plate with different diameter, firstly marking a cutting line on the wind pipe plate, then cutting by using a hand-held cutting machine, and cutting a corner plate with an angle smaller than or larger than 90 degrees, wherein the size of the corner is calculated during marking, and the cutting is carried out after the angle is determined so as to ensure the splicing quality; the air duct is manufactured and installed by using a special adhesive to ensure the bonding quality of the air duct, and before bonding by using the special adhesive, oil stains, water stains, dust, sundries and the like at the bonded part are removed; the special adhesive consists of a powder A group and a liquid B group, is prepared on site according to the specification of a manufacturer, and is stirred by an electric stirrer in order to ensure the uniformity of the special adhesive; the special adhesive has different initial setting time at different environmental temperatures, and particularly, the curing time of the special adhesive is slower when the environmental temperature is lower than 0 ℃.

6. The construction method of the central-positioned connected glass-magnesium composite board split return air channel according to claim 1 is characterized in that: in the step 5, firstly, the step-shaped heat-insulating layer of the side panel is scraped by a scraper to ensure that the steps are smooth, and special glue is coated on the steps on the side surfaces of the left and right panels to ensure that the steps are uniform, full and free of slurry shortage; placing the bottom plate of the air duct on an assembly frame, inserting the left and right side plates at the edge of the bottom plate, and staggering the left and right side plates and the upper and lower plates in the aligning longitudinal bonding direction for 100 mm, and then placing the upper plate between the left and right side plates; positioning by using a gantry-shaped hoop, tightly binding the combined air pipe by using a binding belt, wherein the distance between the binding belts is 650 mm, and the joint of the binding belt and the four corners of the air pipe is protected by using a 90-degree angle bead; when the perimeter of the bundled air pipes is less than 2000 mm, the diagonal error is not more than 3 mm; when the perimeter is larger than 2000 mm, the error of the diagonal line is not larger than 5mm, and the internal angle of the air pipe is temporarily supported to ensure that the corner is 90 degrees; and the extruded residual glue is removed, so that no gap is formed at the joint, and no residual glue is left on the outer wall of the air pipe.

7. The construction method of the central-positioned connected glass-magnesium composite board split return air channel according to claim 1 is characterized in that: in the step 6, flange-free staggered-opening insertion and special glue bonding are adopted, foam materials on the opposite longitudinal bonding surface of the air pipes are scraped for 1-2 mm by using a steel wire brush, then the connection surfaces are glued, and the two sections of connected air pipes are close, straight up and down, straight left and right and accurately positioned; when the length of the straight section of the air pipe reaches or exceeds 20m, 1 telescopic joint is arranged at intervals of 20m, the telescopic joint is made of a plate with the same thickness, a gap between the telescopic joint and the connected air pipe is 5-10 mm, the width of the telescopic joint is 400 mm, the telescopic joint is arranged on the outer surface of the air pipe, the inner edge dimension of the telescopic joint is 3-4 mm larger than the outer edge of the air pipe, the gap between the telescopic joint and the outer wall of the air pipe is 2 mm, a TFF (TEF (transition thin film) foam strip is filled, and a shake-proof support is arranged in the middle of the telescopic joint; the two sides of the left side plate and the right side plate of the air pipe are provided with blades with different sizes, when the specification plate is cut, the step line for combination is cut simultaneously, the heat insulation layer outside the step line is scraped by a tool knife, the right angle of 90 degrees is ensured at the step position, and the cut surface is smooth; the special adhesive is coated on the stepped surface, the special adhesive is uniform, the using amount is reasonably controlled, and the phenomenon that too much residual adhesive extruded after the air pipes are bound causes waste and influences the appearance is avoided; placing the air pipe bottom plate on the assembling pad, coating special glue at the step positions of the left plate and the right plate of the air pipe, inserting the air pipe bottom plate at the edge of the bottom plate, enabling the left plate and the right plate to be staggered with the bottom plate for 100 mm in the aligning longitudinal bonding direction, covering the upper plate, and similarly, enabling the upper plate and the left plate to be staggered for 100 mm to form a staggered interface connected with the air pipe; after the elevation is determined, the form of the air pipe support and the hanger is determined according to the spatial position of the air pipe system, the air pipe bracket is made of C-shaped galvanized steel, and the section steel with corresponding specification is adopted according to the size of the air pipe.

8. The construction method of the central-positioned connected glass-magnesium composite board split return air channel according to claim 1 is characterized in that: in step 7, during vertical installation, the distance between the air pipe brackets should not be greater than 3000 mm.

9. The construction method of the central-positioned connected glass-magnesium composite board split return air channel according to claim 1 is characterized in that: in the step 8, two ends of the air valve are manufactured to be inserted, the outer diameter of an inserting opening of the air valve is equal to the inner diameter of the air pipe, the inserting length is 50mm, and the air valve is fixed by adopting a self-tapping screw; the method is characterized in that flange connection is adopted, one surface of a special flange is sleeved into the wall of the air pipe, the other surface of the special flange is connected with a flange of a valve, and the air pipe is connected with a fan and is connected with an aluminum foil flexible connection air pipe.

10. The construction method of the central-positioned connected glass-magnesium composite board split return air channel according to claim 1 is characterized in that: in step 9, the deviation of the manufacturing and mounting dimensions of the split return air channel of the central-mounted-type connected glass-magnesium composite plate meets the requirements of design and specification.

Technical Field

The invention relates to the technical field of pipeline construction, in particular to a construction method of a central-positioned-type connected glass-magnesium composite plate split return air channel.

Background

In recent years, steel structures are widely applied to factory building buildings, and the air return channel of the large-scale electronic factory building is usually in a steel structure form, namely the air return channel is provided with steel columns and steel supports among the columns. The traditional construction method of the steel structure return air channel is that steel members are assembled and welded in situ at high altitude and then gradually form the whole return air channel, and the construction process has the defects of more times of high-altitude installation of workers, difficulty in control of assembling precision of the high-altitude steel members, long assembling time and the like; the traditional return air channel clamping device is of a return air column structure, namely, non-standard purification plates at the corners of a room are connected through an outer cylinder, holes are formed in the bottoms of plates, air returns from the holes, the traditional return air structure occupies the room space, the arrangement of windows and doors is influenced, the strength of the plates is reduced when the holes are formed in the site, the sealing performance is poor, labor and time are wasted in installation, the process is backward, the angle and the strength of operators are high, the production quality stability is poor, and the like.

Disclosure of Invention

The invention aims to provide a construction method for a middle-mounted connected glass-magnesium composite plate split return air channel, which has the advantages of simple and convenient installation, hollow structure, no risk of leakage of core materials, sanitation and environmental protection, and solves the problems that the traditional construction method of the steel structure return air channel is that steel members gradually form the whole return air channel after high-altitude in-situ split welding, the construction process has the defects of more high-altitude installation times of workers, difficult control of high-altitude steel member splicing precision, long splicing time and the like; traditional return air lane device is the return air post structure, connects at the nonstandard clean board of room corner department with outer cylinder promptly, opens the hole in the panel bottom, and the air is from the entrance to a cave return air, and traditional return air structure occupies room space, influences door and window literary work overall arrangement, and panel strength reduces when opening the hole on the scene, and the leakproofness is poor, and the installation is taken a lot of work and is taken time, and the technology is laggard, and operating personnel angle and intensity are higher, the relatively poor scheduling problem of production quality stability.

In order to achieve the purpose, the invention provides the following technical scheme: the construction method of the middle-mounted connected glass magnesium composite board split return air channel comprises the following steps:

step 1: preparing before construction, and according to the design requirements of a construction scheme and carefully reading a construction drawing, deeply designing a splicing air return channel of the glass-magnesium composite plate connected in a central mode;

step 2: mounting the keel, wherein the keel is required to be mounted on the wall surface covered by the glass-magnesium composite board according to the design drawing requirement;

and step 3: cutting plates, namely cutting straight pipes by adopting a platform, and cutting reducing pipe fittings, such as reducing pipes, tee joints, elbows and the like by adopting a portable cutting machine;

and 4, step 4: prefabricating an air pipe and manufacturing the air pipe, wherein a platform type cutting machine is adopted when rectangular plates are cut, the cutting line of the plates is straight, and a special adhesive is required to be used for manufacturing and installing the air pipe so as to ensure the bonding quality of the air pipe;

and 5: manufacturing a straight pipe, scraping the step-shaped heat insulation layer of the side panel by using a scraper to ensure that the steps are smooth, and coating special glue on the steps on the side surfaces of the left and right panels to ensure that no gap exists at the joint and no residual glue exists on the outer wall of the air pipe;

step 6: the air duct connection and the glass magnesium composite board installation adopt flange-free staggered joint insertion and special adhesive bonding, and special adhesive is coated on the stepped surface, wherein the special adhesive is uniform and the using amount is reasonably controlled;

and 7: hoisting the air pipe, namely vertically installing the air pipe;

and 8: the air pipe is connected with the air valve, two ends of the air valve are made to be inserted, the outer diameter of an insertion opening of the air valve is equal to the inner diameter of the air pipe and is connected with a flange of the valve, and the air pipe is connected with the fan by adopting an aluminum foil flexible connection air pipe;

and step 9: and (5) checking and accepting, wherein the deviation of each manufacturing and mounting dimension meets the requirements of design and specification.

Preferably, in the step 1, according to the design requirement of the construction scheme, carefully reading a construction drawing, deeply designing the splicing return air channel of the centrally-mounted connected glass-magnesium composite plate, implementing site constructors, and performing technical background crossing on the site constructors according to the scheme and the drawing; preparing and checking the quantity and specification of materials and equipment required by a central-positioned connected glass-magnesium composite plate splicing air return channel, wherein the materials and the equipment meet the relevant regulations of national standards; arranging constructors and equipment to enter a field, arranging the construction field and determining the stacking position of entering materials; the method is characterized in that a middle-mounted connected glass magnesium composite board butt-jointed return air channel transportation channel, a hoisting position and the like are defined, and auxiliary materials, tools and other related equipment and the like required in the installation process of the return air channel are prepared.

Preferably, in the step 2, keels are required to be installed on the wall surface covered by the glass-magnesium composite board according to the requirements of a design drawing or a construction drawing, the keels are subjected to leveling treatment, and the surfaces of the keels are smooth and are free of corrosion and five deformation; the structural wall body is subjected to construction pretreatment according to building specifications, and the arrangement size of the keel is matched with the arrangement of the glass-magnesium composite board; the distance between the wood keels is smaller than 300 mm, the distance between the light steel keels is not larger than 400 mm, and the installation of the keels is vertical to the length direction of the glass-magnesium composite board; the distance from the surface of the wood keel to the base layer is generally 50mm according to specific requirements, and the surface flatness and verticality errors of the wood keel are not more than 0.5 mm; the keel gap needs filler, and the installation and treatment are carried out in advance according to the design requirements, and the installation of the glass magnesium composite board is not influenced.

Preferably, in the step 3, the straight pipe is cut by adopting a platform, and the reducing pipe fittings such as reducing pipes, tee joints and elbows and the like are cut by adopting a portable cutting machine; during cutting, the cutting line is straight, the length error of the diagonal line of the board is less than 5mm, and the step line, the cutting line and the board surface form an angle of 90 degrees; and cutting the bonding parts of the left and right plates and the upper and lower plates of the air pipe into a step shape, wherein the depth of the step line is 15 mm.

Preferably, in the step 4, a platform-type cutting machine is adopted when the rectangular plate is cut, the cutting line of the plate is straight, the cutting plane and the plate surface form an angle of 90 degrees, and the diagonal length error of the cut air duct plate is smaller than 3 mm; cutting the wind pipe plate with different diameter, firstly marking a cutting line on the wind pipe plate, then cutting by using a hand-held cutting machine, and cutting a corner plate with an angle smaller than or larger than 90 degrees, wherein the size of the corner is calculated during marking, and the cutting is carried out after the angle is determined so as to ensure the splicing quality; the air duct is manufactured and installed by using a special adhesive to ensure the bonding quality of the air duct, and before bonding by using the special adhesive, oil stains, water stains, dust, sundries and the like at the bonded part are removed; the special adhesive consists of a powder A group and a liquid B group, is prepared on site according to the specification of a manufacturer, and is stirred by an electric stirrer in order to ensure the uniformity of the special adhesive; the special adhesive has different initial setting time at different environmental temperatures, and particularly, the curing time of the special adhesive is slower when the environmental temperature is lower than 0 ℃.

Preferably, in the step 5, the step-shaped heat-insulating layer of the side panel is scraped by a scraper to ensure that the steps are smooth, and special glue is coated on the steps on the side surfaces of the left plate and the right plate, so that the side panels are uniform, full and free of pulp shortage; placing the bottom plate of the air duct on an assembly frame, inserting the left and right side plates at the edge of the bottom plate, and staggering the left and right side plates and the upper and lower plates in the aligning longitudinal bonding direction for 100 mm, and then placing the upper plate between the left and right side plates; positioning by using a gantry-shaped hoop, tightly binding the combined air pipe by using a binding belt, wherein the distance between the binding belts is 650 mm, and the joint of the binding belt and the four corners of the air pipe is protected by using a 90-degree angle bead; when the perimeter of the bundled air pipes is less than 2000 mm, the diagonal error is not more than 3 mm; when the perimeter is larger than 2000 mm, the error of the diagonal line is not larger than 5mm, and the internal angle of the air pipe is temporarily supported to ensure that the corner is 90 degrees; and the extruded residual glue is removed, so that no gap is formed at the joint, and no residual glue is left on the outer wall of the air pipe.

Preferably, in the step 6, flange-free staggered-joint insertion and special glue bonding are adopted, a steel wire brush is used for scraping the foam material on the longitudinal bonding surface of the air pipe opposite to the joint for 1-2 mm, then the glue is applied to the joint surface, and the two sections of connected air pipes are close, straight up, down, left and right and accurately positioned; when the length of the straight section of the air pipe reaches or exceeds 20m, 1 telescopic joint is arranged at intervals of 20m, the telescopic joint is made of a plate with the same thickness, a gap between the telescopic joint and the connected air pipe is 5-10 mm, the width of the telescopic joint is 400 mm, the telescopic joint is arranged on the outer surface of the air pipe, the inner edge dimension of the telescopic joint is 3-4 mm larger than the outer edge of the air pipe, the gap between the telescopic joint and the outer wall of the air pipe is 2 mm, a TFF (TEF (transition thin film) foam strip is filled, and a shake-proof support is arranged in the middle of the telescopic joint; the two sides of the left side plate and the right side plate of the air pipe are provided with blades with different sizes, when the specification plate is cut, the step line for combination is cut simultaneously, the heat insulation layer outside the step line is scraped by a tool knife, the right angle of 90 degrees is ensured at the step position, and the cut surface is smooth; the special adhesive is coated on the stepped surface, the special adhesive is uniform, the using amount is reasonably controlled, and the phenomenon that too much residual adhesive extruded after the air pipes are bound causes waste and influences the appearance is avoided; placing the air pipe bottom plate on the assembling pad, coating special glue at the step positions of the left plate and the right plate of the air pipe, inserting the air pipe bottom plate at the edge of the bottom plate, enabling the left plate and the right plate to be staggered with the bottom plate for 100 mm in the aligning longitudinal bonding direction, covering the upper plate, and similarly, enabling the upper plate and the left plate to be staggered for 100 mm to form a staggered interface connected with the air pipe; after the elevation is determined, the form of the air pipe support and the hanger is determined according to the spatial position of the air pipe system, the air pipe bracket is made of C-shaped galvanized steel, and the section steel with corresponding specification is adopted according to the size of the air pipe.

Preferably, in step 7, the air duct bracket spacing should not be greater than 3000 mm during vertical installation.

Preferably, in the step 8, two ends of the air valve are manufactured to be inserted, the outer diameter of an insertion opening of the air valve is equal to the inner diameter of the air pipe, the insertion length is 50mm, and the air valve is fixed by adopting a self-tapping screw; the method is characterized in that flange connection is adopted, one surface of a special flange is sleeved into the wall of the air pipe, the other surface of the special flange is connected with a flange of a valve, and the air pipe is connected with a fan and is connected with an aluminum foil flexible connection air pipe.

Preferably, in the step 9, the deviation of the manufacturing and mounting sizes of the central-positioned-connected glass-magnesium composite board to the spliced air return channel meets the requirements of design and specification; and (5) performing field detection.

Compared with the prior art, the invention has the beneficial effects that: according to the invention, a 0.5mm composite board is selected to be used for folding two 50 x 79 x 50mm folding pieces on a bending machine, the length of each folding piece is determined according to the length of the board, two 9.5mm gypsum boards, namely a gypsum board A7 and a gypsum board B3, are cut, so that the gypsum boards can be placed into a 10 mm folding composite board, two-component polyurethane foaming glue is coated for bonding, the other side of each gypsum board is bonded with a 20 mm folding composite board, and the gypsum boards are placed on a press bed for pressing for 8-12 hours to form a panel. The channel clamping plate has a structure with 4 surfaces, then a heavy object is placed on the top layer panel and pressurized for 8-12 hours, then the heavy object is taken down, the bent part of the color steel plate with the bending length of 20 mm is riveted with a keel rivet, and a 50-shaped arched keel at the top of the hollow air return channel clamping plate is taken out, so that the manufacturing of the spliced air return channel clamping plate is completed, and the defects that steel members gradually form an air return channel whole after high-altitude in-situ scattered splicing welding in the traditional construction method of the steel structure air return channel are overcome, the construction process has the defects of more high-altitude installation times of workers, difficulty in control of high-altitude steel member splicing precision, long splicing time and the like; the traditional return air channel device is of a return air column structure, namely, nonstandard purification plates are connected at the corners of a room through an outer cylinder, holes are formed in the bottoms of the plates, air returns from the holes, the traditional return air structure occupies the room space, the window and door literary layout is influenced, the strength of the plates is reduced when the holes are formed on site, the sealing performance is poor, the installation is labor-consuming and time-consuming, the process is lagged, the angle and the strength of operators are high, the production quality stability is poor, and the like, the construction method of the splicing return air channel of the glass magnesium composite plate with the built-in connection has the problems that the glass fiber is used as a reinforcing material, the magnesium oxychloride cement is used as a cementing material, the air pipe plates are produced through mechanical processing, the air pipe plates are bonded with the air pipe plates, the splicing return air channel is completely produced in a factory, the requirements of the modular production of rechecking are consistent with the common wall plates, the splicing air return channel plate has the advantages of being relatively simple and convenient, saving labor, being of a hollow structure, being free of the risk of core material leakage, being sanitary and environment-friendly, advanced in process, high in production efficiency, few in operators, low in operation labor intensity and stable in product quality.

Drawings

FIG. 1 is a schematic view of a mid-mount connection according to the present invention;

FIG. 2 is a schematic view of the telescopic joint of the present invention.

Detailed Description

The present invention will now be described in more detail by way of examples, which are given by way of illustration only and are not intended to limit the scope of the present invention in any way.

2. The invention provides a technical scheme that: the construction method of the middle-mounted connected glass magnesium composite board split return air channel comprises the following steps:

step 1: preparing before construction, and according to the design requirements of a construction scheme and carefully reading a construction drawing, deeply designing a splicing air return channel of the glass-magnesium composite plate connected in a central mode;

step 2: mounting the keel, wherein the keel is required to be mounted on the wall surface covered by the glass-magnesium composite board according to the design drawing requirement;

and step 3: cutting plates, namely cutting straight pipes by adopting a platform, and cutting reducing pipe fittings, such as reducing pipes, tee joints, elbows and the like by adopting a portable cutting machine;

and 4, step 4: prefabricating an air pipe and manufacturing the air pipe, wherein a platform type cutting machine is adopted when rectangular plates are cut, the cutting line of the plates is straight, and a special adhesive is required to be used for manufacturing and installing the air pipe so as to ensure the bonding quality of the air pipe;

and 5: manufacturing a straight pipe, scraping the step-shaped heat insulation layer of the side panel by using a scraper to ensure that the steps are smooth, and coating special glue on the steps on the side surfaces of the left and right panels to ensure that no gap exists at the joint and no residual glue exists on the outer wall of the air pipe;

step 6: the air duct connection and the glass magnesium composite board installation adopt flange-free staggered joint insertion and special adhesive bonding, and special adhesive is coated on the stepped surface, wherein the special adhesive is uniform and the using amount is reasonably controlled;

and 7: hoisting the air pipe, namely vertically installing the air pipe;

and 8: the air pipe is connected with the air valve, two ends of the air valve are made to be inserted, the outer diameter of an insertion opening of the air valve is equal to the inner diameter of the air pipe and is connected with a flange of the valve, and the air pipe is connected with the fan by adopting an aluminum foil flexible connection air pipe;

and step 9: and (5) checking and accepting, wherein the deviation of each manufacturing and mounting dimension meets the requirements of design and specification.

The first embodiment is as follows:

preparing before construction, and according to the design requirements of a construction scheme and carefully reading a construction drawing, deeply designing a splicing air return channel of the glass-magnesium composite plate connected in a central mode; mounting the keel, wherein the keel is required to be mounted on the wall surface covered by the glass-magnesium composite board according to the design drawing requirement; cutting plates, namely cutting straight pipes by adopting a platform, and cutting reducing pipe fittings, such as reducing pipes, tee joints, elbows and the like by adopting a portable cutting machine; prefabricating an air pipe and manufacturing the air pipe, wherein a platform type cutting machine is adopted when rectangular plates are cut, the cutting line of the plates is straight, and a special adhesive is required to be used for manufacturing and installing the air pipe so as to ensure the bonding quality of the air pipe; manufacturing a straight pipe, scraping the step-shaped heat insulation layer of the side panel by using a scraper to ensure that the steps are smooth, and coating special glue on the steps on the side surfaces of the left and right panels to ensure that no gap exists at the joint and no residual glue exists on the outer wall of the air pipe; the air duct connection and the glass magnesium composite board installation adopt flange-free staggered joint insertion and special adhesive bonding, and special adhesive is coated on the stepped surface, wherein the special adhesive is uniform and the using amount is reasonably controlled; hoisting the air pipe, namely vertically installing the air pipe; the air pipe is connected with the air valve, two ends of the air valve are made to be inserted, the outer diameter of an insertion opening of the air valve is equal to the inner diameter of the air pipe and is connected with a flange of the valve, and the air pipe is connected with the fan by adopting an aluminum foil flexible connection air pipe; and (5) checking and accepting, wherein the deviation of each manufacturing and mounting dimension meets the requirements of design and specification.

Example two:

in the first embodiment, the following steps are added:

in the step 1, according to the design requirements of a construction scheme, carefully reading a construction drawing, deeply designing a splicing return air channel of the glass-magnesium composite plate connected in a central mode, implementing site constructors, and performing technical interaction on the site constructors according to the scheme and the drawing; preparing and checking the quantity and specification of materials and equipment required by a central-positioned connected glass-magnesium composite plate splicing air return channel, wherein the materials and the equipment meet the relevant regulations of national standards; arranging constructors and equipment to enter a field, arranging the construction field and determining the stacking position of entering materials; the method is characterized in that a middle-mounted connected glass magnesium composite board butt-jointed return air channel transportation channel, a hoisting position and the like are defined, and auxiliary materials, tools and other related equipment and the like required in the installation process of the return air channel are prepared.

Preparing before construction, and according to the design requirements of a construction scheme and carefully reading a construction drawing, deeply designing a splicing air return channel of the glass-magnesium composite plate connected in a central mode; according to the design requirement of a construction scheme, carefully reading a construction drawing, deeply designing a splicing air return channel of the glass-magnesium composite boards connected in a central mode, implementing field construction personnel, and performing technical intersection on the field construction personnel according to the scheme and the drawing; preparing and checking the quantity and specification of materials and equipment required by a central-positioned connected glass-magnesium composite plate splicing air return channel, wherein the materials and the equipment meet the relevant regulations of national standards; arranging constructors and equipment to enter a field, arranging the construction field and determining the stacking position of entering materials; the method comprises the following steps of determining a transportation channel, a hoisting position and the like of a splicing return air channel of the glass-magnesium composite board connected in a central mode, preparing auxiliary materials, tools and other related equipment and the like required in the installation process of the return air channel, installing keels, and installing the keels on the wall surface covered by the glass-magnesium composite board according to the requirements of a design drawing; cutting plates, namely cutting straight pipes by adopting a platform, and cutting reducing pipe fittings, such as reducing pipes, tee joints, elbows and the like by adopting a portable cutting machine; prefabricating an air pipe and manufacturing the air pipe, wherein a platform type cutting machine is adopted when rectangular plates are cut, the cutting line of the plates is straight, and a special adhesive is required to be used for manufacturing and installing the air pipe so as to ensure the bonding quality of the air pipe; manufacturing a straight pipe, scraping the step-shaped heat insulation layer of the side panel by using a scraper to ensure that the steps are smooth, and coating special glue on the steps on the side surfaces of the left and right panels to ensure that no gap exists at the joint and no residual glue exists on the outer wall of the air pipe; the air duct connection and the glass magnesium composite board installation adopt flange-free staggered joint insertion and special adhesive bonding, and special adhesive is coated on the stepped surface, wherein the special adhesive is uniform and the using amount is reasonably controlled; hoisting the air pipe, namely vertically installing the air pipe; the air pipe is connected with the air valve, two ends of the air valve are made to be inserted, the outer diameter of an insertion opening of the air valve is equal to the inner diameter of the air pipe and is connected with a flange of the valve, and the air pipe is connected with the fan by adopting an aluminum foil flexible connection air pipe; and (5) checking and accepting, wherein the deviation of each manufacturing and mounting dimension meets the requirements of design and specification.

Example three:

in the second embodiment, the following steps are added:

in the step 2, keels are required to be installed on the wall surface covered by the glass-magnesium composite board according to the requirements of a design drawing or a construction drawing, the keels are subjected to leveling treatment, and the surfaces of the keels are smooth and are free of corrosion and five deformation; the structural wall body is subjected to construction pretreatment according to building specifications, and the arrangement size of the keel is matched with the arrangement of the glass-magnesium composite board; the distance between the wood keels is smaller than 300 mm, the distance between the light steel keels is not larger than 400 mm, and the installation of the keels is vertical to the length direction of the glass-magnesium composite board; the distance from the surface of the wood keel to the base layer is generally 50mm according to specific requirements, and the surface flatness and verticality errors of the wood keel are not more than 0.5 mm; the required filler in the keel gap is firstly installed and processed according to the design requirement, and the installation of the glass-magnesium composite board is not influenced;

in step 3, the straight pipe is cut by adopting a platform, and the reducing pipe fittings, such as reducing pipes, tee joints, elbows and the like, and the plates are cut by adopting a hand-held cutting machine; during cutting, the cutting line is straight, the length error of the diagonal line of the board is less than 5mm, and the step line, the cutting line and the board surface form an angle of 90 degrees; cutting the bonding positions of the left and right plates and the upper and lower plates of the air pipe into a step shape, wherein the depth of the step line is 15 mm;

in the step 4, a platform type cutting machine is adopted when the rectangular plate is cut, the cutting line of the plate is straight, the cutting plane and the plate surface form an angle of 90 degrees, and the diagonal length error of the cut air duct plate is smaller than 3 mm; cutting the wind pipe plate with different diameter, firstly marking a cutting line on the wind pipe plate, then cutting by using a hand-held cutting machine, and cutting a corner plate with an angle smaller than or larger than 90 degrees, wherein the size of the corner is calculated during marking, and the cutting is carried out after the angle is determined so as to ensure the splicing quality; the air duct is manufactured and installed by using a special adhesive to ensure the bonding quality of the air duct, and before bonding by using the special adhesive, oil stains, water stains, dust, sundries and the like at the bonded part are removed; the special adhesive consists of a powder A group and a liquid B group, is prepared on site according to the specification of a manufacturer, and is stirred by an electric stirrer in order to ensure the uniformity of the special adhesive; the special adhesive has different initial setting time at different environmental temperatures, and particularly, the curing time of the special adhesive is slower when the environmental temperature is lower than 0 ℃.

Preparing before construction, carefully reading a construction drawing according to the design requirement of a construction scheme, deeply designing a splicing air return channel for the glass-magnesium composite boards connected in a central mode, carefully reading the construction drawing according to the design requirement of the construction scheme, deeply designing the splicing air return channel for the glass-magnesium composite boards connected in the central mode, implementing site constructors, and technically mating the site constructors according to the scheme and the drawing; preparing and checking the quantity and specification of materials and equipment required by a central-positioned connected glass-magnesium composite plate splicing air return channel, wherein the materials and the equipment meet the relevant regulations of national standards; arranging constructors and equipment to enter a field, arranging the construction field and determining the stacking position of entering materials; the method comprises the following steps of determining a transport channel, a hoisting position and the like of a splicing return air channel of the glass-magnesium composite plate connected in a central mode, and preparing auxiliary materials, tools and other related equipment and the like required in the installation process of the return air channel; mounting the keel, wherein the keel is required to be mounted on the wall surface covered by the glass-magnesium composite board according to the design drawing requirement; cutting plates, namely cutting straight pipes by adopting a platform, and cutting reducing pipe fittings, such as reducing pipes, tee joints, elbows and the like by adopting a portable cutting machine; prefabricating an air pipe and manufacturing the air pipe, wherein a platform type cutting machine is adopted when rectangular plates are cut, the cutting line of the plates is straight, and a special adhesive is required to be used for manufacturing and installing the air pipe so as to ensure the bonding quality of the air pipe; manufacturing a straight pipe, scraping the step-shaped heat insulation layer of the side panel by using a scraper to ensure that the steps are smooth, and coating special glue on the steps on the side surfaces of the left and right panels to ensure that no gap exists at the joint and no residual glue exists on the outer wall of the air pipe; the wall surface covered by the glass-magnesium composite board is required to be provided with the keel according to the requirements of a design drawing or a construction drawing, and the keel is leveled, and the surface of the keel is smooth and has no corrosion or five deformations; the structural wall body is subjected to construction pretreatment according to building specifications, and the arrangement size of the keel is matched with the arrangement of the glass-magnesium composite board; the distance between the wood keels is smaller than 300 mm, the distance between the light steel keels is not larger than 400 mm, and the installation of the keels is vertical to the length direction of the glass-magnesium composite board; the distance from the surface of the wood keel to the base layer is generally 50mm according to specific requirements, and the surface flatness and verticality errors of the wood keel are not more than 0.5 mm; the required filler in the keel gap is firstly installed and processed according to the design requirement, and the installation of the glass-magnesium composite board is not influenced; in step 3, the straight pipe is cut by adopting a platform, and the reducing pipe fittings, such as reducing pipes, tee joints, elbows and the like, and the plates are cut by adopting a hand-held cutting machine; during cutting, the cutting line is straight, the length error of the diagonal line of the board is less than 5mm, and the step line, the cutting line and the board surface form an angle of 90 degrees; cutting the bonding positions of the left and right plates and the upper and lower plates of the air pipe into a step shape, wherein the depth of the step line is 15 mm; in the step 4, a platform type cutting machine is adopted when the rectangular plate is cut, the cutting line of the plate is straight, the cutting plane and the plate surface form an angle of 90 degrees, and the diagonal length error of the cut air duct plate is smaller than 3 mm; cutting the wind pipe plate with different diameter, firstly marking a cutting line on the wind pipe plate, then cutting by using a hand-held cutting machine, and cutting a corner plate with an angle smaller than or larger than 90 degrees, wherein the size of the corner is calculated during marking, and the cutting is carried out after the angle is determined so as to ensure the splicing quality; the air duct is manufactured and installed by using a special adhesive to ensure the bonding quality of the air duct, and before bonding by using the special adhesive, oil stains, water stains, dust, sundries and the like at the bonded part are removed; the special adhesive consists of a powder A group and a liquid B group, is prepared on site according to the specification of a manufacturer, and is stirred by an electric stirrer in order to ensure the uniformity of the special adhesive; the special adhesive has different initial setting times at different environmental temperatures, and particularly, when the environmental temperature is lower than 0 ℃, the curing time of the special adhesive is slower; the air duct connection and the glass magnesium composite board installation adopt flange-free staggered joint insertion and special adhesive bonding, and special adhesive is coated on the stepped surface, wherein the special adhesive is uniform and the using amount is reasonably controlled; hoisting the air pipe, namely vertically installing the air pipe; the air pipe is connected with the air valve, two ends of the air valve are made to be inserted, the outer diameter of an insertion opening of the air valve is equal to the inner diameter of the air pipe and is connected with a flange of the valve, and the air pipe is connected with the fan by adopting an aluminum foil flexible connection air pipe; and (5) checking and accepting, wherein the deviation of each manufacturing and mounting dimension meets the requirements of design and specification.

Example four:

in the third embodiment, the following steps are added:

in step 5, scraping off the step-shaped heat-insulating layer of the side panel by using a scraper to ensure that the steps are smooth, and coating special glue on the steps on the side surfaces of the left and right panels to ensure that the steps are uniform, full and free of slurry shortage; placing the bottom plate of the air duct on an assembly frame, inserting the left and right side plates at the edge of the bottom plate, and staggering the left and right side plates and the upper and lower plates in the aligning longitudinal bonding direction for 100 mm, and then placing the upper plate between the left and right side plates; positioning by using a gantry-shaped hoop, tightly binding the combined air pipe by using a binding belt, wherein the distance between the binding belts is 650 mm, and the joint of the binding belt and the four corners of the air pipe is protected by using a 90-degree angle bead; when the perimeter of the bundled air pipes is less than 2000 mm, the diagonal error is not more than 3 mm; when the perimeter is larger than 2000 mm, the error of the diagonal line is not larger than 5mm, and the internal angle of the air pipe is temporarily supported to ensure that the corner is 90 degrees; removing the residual glue extruded out, ensuring that no gap exists at the joint and no residual glue exists on the outer wall of the air pipe;

in the step 6, flange-free staggered-opening insertion and special glue bonding are adopted, foam materials on the opposite longitudinal bonding surface of the air pipes are scraped for 1-2 mm by using a steel wire brush, then the connection surfaces are glued, the two sections of connected air pipes are close, straight up and down, straight left and right, and accurately positioned; when the length of the straight section of the air pipe reaches or exceeds 20m, 1 telescopic joint is arranged at intervals of 20m, the telescopic joint is made of a plate with the same thickness, a gap between the telescopic joint and the connected air pipe is 5-10 mm, the width of the telescopic joint is 400 mm, the telescopic joint is arranged on the outer surface of the air pipe, the inner edge dimension of the telescopic joint is 3-4 mm larger than the outer edge of the air pipe, the gap between the telescopic joint and the outer wall of the air pipe is 2 mm, a TFF (TEF (transition thin film) foam strip is filled, and a shake-proof support is arranged in the middle of the telescopic joint; the two sides of the left side plate and the right side plate of the air pipe are provided with blades with different sizes, when the specification plate is cut, the step line for combination is cut simultaneously, the heat insulation layer outside the step line is scraped by a tool knife, the right angle of 90 degrees is ensured at the step position, and the cut surface is smooth; the special adhesive is coated on the stepped surface, the special adhesive is uniform, the using amount is reasonably controlled, and the phenomenon that too much residual adhesive extruded after the air pipes are bound causes waste and influences the appearance is avoided; placing the air pipe bottom plate on the assembling pad, coating special glue at the step positions of the left plate and the right plate of the air pipe, inserting the air pipe bottom plate at the edge of the bottom plate, enabling the left plate and the right plate to be staggered with the bottom plate for 100 mm in the aligning longitudinal bonding direction, covering the upper plate, and similarly, enabling the upper plate and the left plate to be staggered for 100 mm to form a staggered interface connected with the air pipe; after the elevation is determined, the form of the air pipe support and the hanger is determined according to the spatial position of the air pipe system, the air pipe bracket adopts C-shaped galvanized steel, and the section steel with corresponding specification is adopted according to the size of the air pipe;

in step 7, when vertically installing, the distance between the air pipe brackets should not be more than 3000 mm;

in the step 8, two ends of the air valve are manufactured to be inserted, the outer diameter of an inserting opening of the air valve is equal to the inner diameter of the air pipe, the inserting length is 50mm, and the air valve is fixed by adopting self-tapping screws; the special flange is connected by a flange, one side of the special flange is sleeved into the wall of the air pipe, the other side of the special flange is connected with the flange of the valve, and the air pipe is connected with the fan by an aluminum foil flexible connection air pipe;

in step 9, the deviation of the manufacturing and mounting dimensions of the split return air channel of the central-mounted-type connected glass-magnesium composite plate meets the requirements of design and specification.

Preparing before construction, carefully reading a construction drawing according to the design requirement of a construction scheme, deeply designing a splicing air return channel for the glass-magnesium composite boards connected in a central mode, carefully reading the construction drawing according to the design requirement of the construction scheme, deeply designing the splicing air return channel for the glass-magnesium composite boards connected in the central mode, implementing site constructors, and technically mating the site constructors according to the scheme and the drawing; preparing and checking the quantity and specification of materials and equipment required by a central-positioned connected glass-magnesium composite plate splicing air return channel, wherein the materials and the equipment meet the relevant regulations of national standards; arranging constructors and equipment to enter a field, arranging the construction field and determining the stacking position of entering materials; the method comprises the following steps of defining a middle-mounted connected glass magnesium composite board butt-jointed return air channel transportation channel, a hoisting position and the like, and preparing auxiliary materials, tools and other related equipment and the like required in the installation process of the return air channel; mounting the keel, wherein the keel is required to be mounted on the wall surface covered by the glass-magnesium composite board according to the design drawing requirement; cutting plates, namely cutting straight pipes by adopting a platform, and cutting reducing pipe fittings, such as reducing pipes, tee joints, elbows and the like by adopting a portable cutting machine; prefabricating an air pipe and manufacturing the air pipe, wherein a platform type cutting machine is adopted when rectangular plates are cut, the cutting line of the plates is straight, and a special adhesive is required to be used for manufacturing and installing the air pipe so as to ensure the bonding quality of the air pipe; manufacturing a straight pipe, scraping the step-shaped heat insulation layer of the side panel by using a scraper to ensure that the steps are smooth, and coating special glue on the steps on the side surfaces of the left and right panels to ensure that no gap exists at the joint and no residual glue exists on the outer wall of the air pipe; the wall surface covered by the glass-magnesium composite board is required to be provided with the keel according to the requirements of a design drawing or a construction drawing, and the keel is leveled, and the surface of the keel is smooth and has no corrosion or five deformations; the structural wall body is subjected to construction pretreatment according to building specifications, and the arrangement size of the keel is matched with the arrangement of the glass-magnesium composite board; the distance between the wood keels is smaller than 300 mm, the distance between the light steel keels is not larger than 400 mm, and the installation of the keels is vertical to the length direction of the glass-magnesium composite board; the distance from the surface of the wood keel to the base layer is generally 50mm according to specific requirements, and the surface flatness and verticality errors of the wood keel are not more than 0.5 mm; the required filler in the keel gap is firstly installed and processed according to the design requirement, and the installation of the glass-magnesium composite board is not influenced; in step 3, the straight pipe is cut by adopting a platform, and the reducing pipe fittings, such as reducing pipes, tee joints, elbows and the like, and the plates are cut by adopting a hand-held cutting machine; during cutting, the cutting line is straight, the length error of the diagonal line of the board is less than 5mm, and the step line, the cutting line and the board surface form an angle of 90 degrees; cutting the bonding positions of the left and right plates and the upper and lower plates of the air pipe into a step shape, wherein the depth of the step line is 15 mm; in the step 4, a platform type cutting machine is adopted when the rectangular plate is cut, the cutting line of the plate is straight, the cutting plane and the plate surface form an angle of 90 degrees, and the diagonal length error of the cut air duct plate is smaller than 3 mm; cutting the wind pipe plate with different diameter, firstly marking a cutting line on the wind pipe plate, then cutting by using a hand-held cutting machine, and cutting a corner plate with an angle smaller than or larger than 90 degrees, wherein the size of the corner is calculated during marking, and the cutting is carried out after the angle is determined so as to ensure the splicing quality; the air duct is manufactured and installed by using a special adhesive to ensure the bonding quality of the air duct, and before bonding by using the special adhesive, oil stains, water stains, dust, sundries and the like at the bonded part are removed; the special adhesive consists of a powder A group and a liquid B group, is prepared on site according to the specification of a manufacturer, and is stirred by an electric stirrer in order to ensure the uniformity of the special adhesive; the special adhesive has different initial setting times at different environmental temperatures, particularly when the environmental temperature is lower than 0 ℃, the curing time of the special adhesive is slower, the air duct connection and the glass-magnesium composite board installation adopt flange-free staggered-joint insertion and special adhesive bonding, the special adhesive is coated on the stepped surface, the special adhesive is uniform, and the using amount is reasonably controlled; hoisting the air pipe, namely vertically installing the air pipe; the air pipe is connected with the air valve, two ends of the air valve are made to be inserted, the outer diameter of an insertion opening of the air valve is equal to the inner diameter of the air pipe and is connected with a flange of the valve, and the air pipe is connected with the fan by adopting an aluminum foil flexible connection air pipe; checking and accepting, wherein the deviation of each manufacturing and mounting dimension meets the design and specification requirements, firstly, scraping the step-shaped heat-insulating layer of the side panel by using a scraper to ensure that the steps are smooth, and coating special glue on the steps on the side surfaces of the left and right panels to ensure that the steps are uniform, full and free of slurry shortage; placing the bottom plate of the air duct on an assembly frame, inserting the left and right side plates at the edge of the bottom plate, and staggering the left and right side plates and the upper and lower plates in the aligning longitudinal bonding direction for 100 mm, and then placing the upper plate between the left and right side plates; positioning by using a gantry-shaped hoop, tightly binding the combined air pipe by using a binding belt, wherein the distance between the binding belts is 650 mm, and the joint of the binding belt and the four corners of the air pipe is protected by using a 90-degree angle bead; when the perimeter of the bundled air pipes is less than 2000 mm, the diagonal error is not more than 3 mm; when the perimeter is larger than 2000 mm, the error of the diagonal line is not larger than 5mm, and the internal angle of the air pipe is temporarily supported to ensure that the corner is 90 degrees; removing the residual glue extruded out, ensuring that no gap exists at the joint and no residual glue exists on the outer wall of the air pipe; adopting flange-free staggered splicing and special glue bonding, scraping off the foam material on the opposite longitudinal bonding surface of the air pipe by using a steel wire brush for gluing on the connecting surface, and enabling the two sections of connected air pipes to be close, straight up and down, right and left and accurately positioned; when the length of the straight section of the air pipe reaches or exceeds 20m, 1 telescopic joint is arranged at intervals of 20m, the telescopic joint is made of a plate with the same thickness, a gap between the telescopic joint and the connected air pipe is 5-10 mm, the width of the telescopic joint is 400 mm, the telescopic joint is arranged on the outer surface of the air pipe, the inner edge dimension of the telescopic joint is 3-4 mm larger than the outer edge of the air pipe, the gap between the telescopic joint and the outer wall of the air pipe is 2 mm, a TFF (TEF (transition thin film) foam strip is filled, and a shake-proof support is arranged in the middle of the telescopic joint; the two sides of the left side plate and the right side plate of the air pipe are provided with blades with different sizes, when the specification plate is cut, the step line for combination is cut simultaneously, the heat insulation layer outside the step line is scraped by a tool knife, the right angle of 90 degrees is ensured at the step position, and the cut surface is smooth; the special adhesive is coated on the stepped surface, the special adhesive is uniform, the using amount is reasonably controlled, and the phenomenon that too much residual adhesive extruded after the air pipes are bound causes waste and influences the appearance is avoided; placing the air pipe bottom plate on the assembling pad, coating special glue at the step positions of the left plate and the right plate of the air pipe, inserting the air pipe bottom plate at the edge of the bottom plate, enabling the left plate and the right plate to be staggered with the bottom plate for 100 mm in the aligning longitudinal bonding direction, covering the upper plate, and similarly, enabling the upper plate and the left plate to be staggered for 100 mm to form a staggered interface connected with the air pipe; after the elevation is determined, the form of the air pipe support and the hanger is determined according to the spatial position of the air pipe system, the air pipe bracket adopts C-shaped galvanized steel, and the section steel with corresponding specification is adopted according to the size of the air pipe; when the air pipe supports are vertically installed, the distance between the air pipe supports is not more than 3000 mm; manufacturing two ends of an air valve in an inserting manner, wherein the outer diameter of an inserting opening of the air valve is equal to the inner diameter of the air pipe, the inserting length is 50mm, and the air valve is fixed by adopting self-tapping screws; the special flange is connected by a flange, one side of the special flange is sleeved into the wall of the air pipe, the other side of the special flange is connected with the flange of the valve, and the air pipe is connected with the fan by an aluminum foil flexible connection air pipe; the deviation of various manufacturing and mounting dimensions of the split return air channel of the central-positioned-type connected glass magnesium composite board meets the requirements of design and specification.

Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.